Microstructure of the shell of a permian spiriferid brachiopod

Armstrong J.D. (1968) Microstructure of the shell of a permian spiriferid brachiopod. Journal of the Geological Society of Australia, 15 2: 183-188. doi:10.1080/00167616808728692


Author Armstrong J.D.
Title Microstructure of the shell of a permian spiriferid brachiopod
Journal name Journal of the Geological Society of Australia
ISSN 0016-7614
Publication date 1968-01-01
Sub-type Article (original research)
DOI 10.1080/00167616808728692
Volume 15
Issue 2
Start page 183
End page 188
Total pages 6
Subject 1900 Earth and Planetary Sciences
1901 Art Theory and Criticism
Abstract The shell of Subansiria sp. is composed of two distinct layers. The primary or outer layer is approximately 0#lb1 mm thick and appears to consist of a granular outer part and an inner portion in which small crystals are oriented normal to the surface of the layer. The secondary or inner layer of the shell comprises elongate fibres inclined obliquely forwards at a low angle from the exterior to the interior of the shell. Transverse sections show the cross‐sectional outlines of the fibres of the secondary layer. The characteristic spatulate outline of the end of each secondary layer fibre on the internal surface of the shell is produced by the overlap of successive fibres. In radial section the fibres of the secondary layer underlying the area of attachment of the muscles in the pedicle valve are similar to those in other parts of the layer except that they are several times larger. The shell is punctate and around each puncta the fibres of the secondary layer are deflected towards the external surface of the shell.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Sat, 09 Jul 2016, 17:30:01 EST by System User